misc.c 3.22 KB
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// SPDX-License-Identifier: GPL-2.0
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/*
 * misc.c
 * 
 * This is a collection of several routines from gzip-1.0.3 
 * adapted for Linux.
 *
 * malloc by Hannu Savolainen 1993 and Matthias Urlichs 1994
 *
 * Modified for ARM Linux by Russell King
 *
 * Nicolas Pitre <nico@visuaide.com>  1999/04/14 :
 *  For this code to run directly from Flash, all constant variables must
 *  be marked with 'const' and all other variables initialized at run-time 
 *  only.  This way all non constant variables will end up in the bss segment,
 *  which should point to addresses in RAM and cleared to 0 on start.
 *  This allows for a much quicker boot time.
 */

unsigned int __machine_arch_type;

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#include <linux/compiler.h>	/* for inline */
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#include <linux/types.h>
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#include <linux/linkage.h>
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static void putstr(const char *ptr);
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extern void error(char *x);
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#include CONFIG_UNCOMPRESS_INCLUDE
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#ifdef CONFIG_DEBUG_ICEDCC
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#if defined(CONFIG_CPU_V6) || defined(CONFIG_CPU_V6K) || defined(CONFIG_CPU_V7)
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static void icedcc_putc(int ch)
{
	int status, i = 0x4000000;

	do {
		if (--i < 0)
			return;

		asm volatile ("mrc p14, 0, %0, c0, c1, 0" : "=r" (status));
	} while (status & (1 << 29));

	asm("mcr p14, 0, %0, c0, c5, 0" : : "r" (ch));
}
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#elif defined(CONFIG_CPU_XSCALE)

static void icedcc_putc(int ch)
{
	int status, i = 0x4000000;

	do {
		if (--i < 0)
			return;

		asm volatile ("mrc p14, 0, %0, c14, c0, 0" : "=r" (status));
	} while (status & (1 << 28));

	asm("mcr p14, 0, %0, c8, c0, 0" : : "r" (ch));
}
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#else

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static void icedcc_putc(int ch)
{
	int status, i = 0x4000000;

	do {
		if (--i < 0)
			return;

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		asm volatile ("mrc p14, 0, %0, c0, c0, 0" : "=r" (status));
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	} while (status & 2);

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	asm("mcr p14, 0, %0, c1, c0, 0" : : "r" (ch));
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}

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#endif

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#define putc(ch)	icedcc_putc(ch)
#endif
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static void putstr(const char *ptr)
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{
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	char c;

	while ((c = *ptr++) != '\0') {
		if (c == '\n')
			putc('\r');
		putc(c);
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	}
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	flush();
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}

/*
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 * gzip declarations
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 */
extern char input_data[];
extern char input_data_end[];

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unsigned char *output_data;
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unsigned long free_mem_ptr;
unsigned long free_mem_end_ptr;
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#ifndef arch_error
#define arch_error(x)
#endif

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void error(char *x)
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{
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	arch_error(x);

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	putstr("\n\n");
	putstr(x);
	putstr("\n\n -- System halted");

	while(1);	/* Halt */
}

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asmlinkage void __div0(void)
{
	error("Attempting division by 0!");
}

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unsigned long __stack_chk_guard;

void __stack_chk_guard_setup(void)
{
	__stack_chk_guard = 0x000a0dff;
}

void __stack_chk_fail(void)
{
	error("stack-protector: Kernel stack is corrupted\n");
}

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extern int do_decompress(u8 *input, int len, u8 *output, void (*error)(char *x));
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void
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decompress_kernel(unsigned long output_start, unsigned long free_mem_ptr_p,
		unsigned long free_mem_ptr_end_p,
		int arch_id)
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{
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	int ret;
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	__stack_chk_guard_setup();

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	output_data		= (unsigned char *)output_start;
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	free_mem_ptr		= free_mem_ptr_p;
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	free_mem_end_ptr	= free_mem_ptr_end_p;
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	__machine_arch_type	= arch_id;

	arch_decomp_setup();

	putstr("Uncompressing Linux...");
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	ret = do_decompress(input_data, input_data_end - input_data,
			    output_data, error);
	if (ret)
		error("decompressor returned an error");
	else
		putstr(" done, booting the kernel.\n");
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}
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void fortify_panic(const char *name)
{
	error("detected buffer overflow");
}